Thanks a lot, as it stands I may ask if I can borrow that fixie you mentioned earlier, cycling to work on that MTB adds about 5 minutes full pelt to what is essentially a 10min journey if taking it easy and im covered in sweat by the time I get there. Oosh I bet that Mercian is a beut. How did you figure out that other frame was a mere plain gauge? Did it just not have a sticker, did you do the tap test or do you have a portable x-ray machine?
Only just heard about this 6 bolt cog for the fixed cog thing. I am intrigued, looks great!